Art of manufacturing one-piece folded sheet-metal sap-receptacles.



C. STOLLBERG.

ART OF MANUFACTURING ONE PIECE FOLDED SHEET METAL SAP REGEPTAGLES.

APPLIOATION FILED une, 1908.

Patented Dec. 31, 1912.

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C. STOLLBERG.

lART 0F MANUFACTURING ONE PIECE PoLDED SHEET METAL SAP REGEPTAGLES.

APPLICATION FILED APR. 6. 1908.

Patented Deo. 31, 1912.

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UNITED sTATEs PATENT oEErcE.

CHARLES STOLLBERG, 0F TOLEDO, OHIO, ASSIG-NOR T0 AMERICAN CAN COMPANY, OF

NEW YORK, N. Y., A CORPORATION OF NEW J ART OF MANUFACTURING ONE-PIECE FOLDED SHEET-METAL SAP-RECEPTACLES.

Specification of Letters Patent.

Patented Dec. 31, 1912.

To all whom it may concern:

Be it known that I, CHARLES STOLLBERG, a citizen of the United States, residing in Toledo, in the county of Lucas and State of Ohio, have invented a new and useful Improvement in the Art of Manufacturing One-Piece Folded Sheet-Metal Sap-Recep tacles, of which the following is a specification.

Myvinvention relates to art of manufacturingone piece sheet metalfolded turpentine collecting cups or sap receptacles.

Heretofore it has been impossible to make durable and satisfactory one piece folded sheet metal turpentine collecting cups of galvanized sheet iron or steel either out of previously or commercially galvanized sheets or out of plain black sheets and subsequently galvanizing'the cup or vessel after it is folded and formed up into shape. Because, if on the one hand, it is attempted to make the cup of ordinary galvanized sheet iron or steel, the sharp bending and folding of the sheet causes the ordinary galvanizing coatin or spelter'toake or sca-le 0E durin the olding or forming operation at the s'arp bends or folds, and especially 'atv the bottom corners of the vessel where the angle folds come to a sharp point and where the stock'receives more or less of a twist/in addition to its sharp bends or folds, so that the vessel will speedily rust through on exposure to the where the spelter coating is liaked off, and thus become leaky and useless. And because, if on the other hand, it is attempted'to make the cup of an Iordinary black iron or steel sheet and do the galvanizing or spel'ter coating after the cup is folded and formed up into shape, the confined pockets produced by the angle folds and locking lips ofthe folded vessel will causev the interior surfaces of such folds or pockets to be imperfectly cleaned or brightened by the acid of the picklin bath, to be imperfectly washed free from t e pickling acid in the subsequent washing step and lto be imperfectly coated by the spelter in the final step of the alvanizing process; so that the galvanized oldcd cup thus produced will speedily rust through and become leaky and worthless, the destruction being doubtless chiefly due to the acid of the pickling bat-h (whlch is confined in or between the angle folds and impossible of complete removal,) attacking the iron or at the folds and corners steel and causing speedy rusting and destruction of the vessel.

The objectof my invention is to provide an improved method or process of manufacturing one piece folded sheet metal sap receptacle of galvanized ironl or steel in which all parts of the receptacle, inside and out, will have a galvanizing or spelter coating, and be efficient and durable and pro tected from rusting through or deterioration on exposure to'the weather. I have discovered that this object or result can be prac tically accomplished by making the one piece folded sheet metal receptacle out of galvanized sheet iron or steel in which the galvanizing or spelter coating is extraordinarily thin, preferablyless than half 'the thickness of the coating ordinarily found upon commercial galvanized sheet ironor steel, such thin spelter coating being applied tothe sheets while they are in the flat and prior to the forming and folding of the receptacle therefrom.

I have discovered and demonstrated by'l experiment and practical use that .a one piece folded sap receptacle of galvanized sheet iron or steel in which the galvanizing or spelter coating is reduced from the customary two and a half ounces to the square foot as -ordinarily used, to onel ounce or yone an a quarter ounces per s uare foot, that all parts of the sheet after 1t is Vfolded into the receptacle will remain fully and perfectly covered and coated by thev spelter at the sharp corners and folds, as well as elsewhere,

and without any tendency to flake off.. And.

as in my invention the thin, bendable, nonakeable galvanizing or spelter coatingis applied to the black sheet prior to the formation of the receptacle, the angle folds and other confined pockets of thereceptacles are not only fully and. erfectly coated with the spelter, but the diculty arising from the rusting throu h of these parts by yreason of imper ect was ing or removal of the pickling acid, is entirely one away with.

In the accompanying drawing forming` a part of this specification, Figure 1 is a front elevation of a one piece folded galvanized sheet steel or iron sap receptacle manufactured by my invention, the same being shown as applied to the turpentine bearing tree. Fig. 2 is a vertical cross section on line 2-2 of Fig. 1. Fig. 3 isa section' on line 3-3 of Fig. 2. Fig. 4 is an end elevation. Fig. 5

l vis a section n line 5--5 of F ig. 4. Fig. 6 is laged detail sect-ion showing the galvaniz ing coating or spelter on the iron or steel Y' sheet and Fig. 9 is a cross sectional view showing the difference in thickness between the spelter coating which I employ, and that ordinarily found upon commercial galvanized Sheet steel or iron. Fig. 10 is an end view and Fig. 11 a vertical cross section illustrating a modification in which the locking lips d4 are located on the flaring ends cl2 instead of on one of the angle folds d3 and in which the supporting hook is formed on oneof the upright sides of the vessel and integral therewith. 'v

In the drawing, A represents a portion of a turpentine bearing or other sap bearing tree in the cut or incision a of which is inserted 4a sheet metal apron B of any suitable kind. or construction, andD is my improved galvanized sheet iron or steel one piece folded sap receptacle. The apron B is preferably of'galvanized sheet steel, and is furnished with an upper concavely curved edge b adapted for insertion in the cut or incision a of the tree. At its ends the galvanized sheet steel apron B is provided with divergent upwardly projecting end flanges b1, each Aof which may be provided at its upper part with a downwardly extending inclined slot or notch b2 toreceive a wire or other hook C with which the receptacle D is or may be. provided to removably support said vessel from the apron. The sheet metal apron B is composed of an iron or steel sheet B1 having on both sides a galvanizing or spelter coating B2.

l n The one piece folded galvanized sheet steel receptacle D is preferably of a long, narrow, deep form, and consists of an integral tlatrectangular bottom d, substantially upright--but ...slightly flaring sides (Z1 and widely flaring ends d2 and anglefolds d3 and locking lips d* forholding or clamping the angle folds snugly against the Haring ends of the vessel. The one piece folded sap receptacle D is composed of sheet steel or iron D1 having upon both sides an extremely thin galvanizing or spelter coating D2, said coating being preferably in thickness or amount about one ounce to the square foot, although it may vary somewhattherefrom in extent.

The galvanizing coating or spelter D2 is applied tothe sheet steel or blank in the flat andv before it is formed or folded into shape, the extreme thinness or tenuity of the spelter coating enabling the required angle folds and bends to be formed without causing the accepta interengaging hooks or supporting devices on the apron and receptacle may be of any suitable kind or construction, and I. have in the drawing simply illustrated one form of such hooks or supporting devices to venable my invention to be more fully understood.

The relative thickness of the galvanizing coating or spelter D2 employed in my invention as compared with the ordinary spelter or galvanizing coating ordinarily found on galvanized vsheet steel or iron, -will be readily understood by those skilled in the art from Figs. 8 and 9 of the drawing. In Fig. 8, F represents an iron orsteel sheet and F1 the ordinary spelter or galvanizi'ng coating .nizing coatings heretofore found on galvanized iron or steel sheets.

I claim 1'- f 1. The improvement in the art of manufacturingv one piece folded sheet meta-l turpen'tine collecting cups, consisting` in first providing steel sheets with a thin and bendable spelter or galvanizing coating, then cuti ting the sheet into cup blanks and ztheny forming and folding the cup blank into a cup with integral bottom, sides, ends and angle folds turned flat against said ends, said forming and folding involving a twisting bof the stock at the corners of the vessel and being done without flaking or peeling ofi said spelter coating, and the eXtreme thinness of such coating coperating in the folding operation to accomplish this result,

'substantially as specified.

2. The process consisting in first galva- 'nizing steel sheets with a thin ycoating of spelter of about one ounce to the square foot and then cutting cup blanks therefrom and forming and folding such blanksl into cups or vessels, each having an integral bottom, sides, ends and angle folds turned flat against said ends, said forming and folding involving a twisting of the stock at the cornersof the vessel and being done without flaking or peeling off said spelter coating, and the extreme thinness of such coating coperating in the folding operation to accomplish this result, substantially as specified.

EDMUND AnoocK, H. M. MUNDAY. 

